Unducted thrust-generating assembly comprising an outer guide vane

Abstract

The present invention relates to a flow-straightening stator (5) of an unducted thrust-generating assembly (3) comprising a plurality of blades (7) each having: —a tip (11) and a radially inner boundary (10) corresponding to an intersection between the blade (7) and a casing (8) of the turbine engine (1); —a skeleton (16); and—a deviation (S) of the profile, corresponding to an absolute value of a difference between a tangent to the skeleton (16) at the leading edge (14) and a tangent to the skeleton (16) at the trailing edge (15) of the blade (7), of between 20° and 450 at the radially inner boundary (10) of the blade (7) and between 10° and 40° at the tip (11) of the blade (7).

1 . Outer guide vanes of an unducted thrust-generating assembly for a turbine engine, the outer guide vanes comprising a plurality of vanes each having:
 a tip and a radially inner boundary corresponding to an intersection between the vane and a casing of the turbine engine;   a skeleton corresponding to an imaginary line extending from a leading edge to a trailing edge of the vane, the skeleton being equidistant between a pressure surface and a suction surface of the vane; and   a deviation of a profile of the vane, the deviation corresponding to an absolute value of a difference between a tangent to the skeleton at the leading edge and a tangent to the skeleton at the trailing edge of the vane, of between 20° and 45° at the radially inner boundary of the vane and between 10° and 40° at the tip of the vane.   
     
     
         2 . The outer guide vanes according to  claim 1 , wherein the deviation of the profile of each vane at the radially inner boundary of the vane is of between 250 and 35°. 
     
     
         3 . The outer guide vanes according to  claim 1 , wherein a minimum deviation of the profile of each vane is located at a distance from the radially inner boundary of the vane of between 40% and 100%. 
     
     
         4 . The outer guide vanes according to  claim 1 , wherein the deviation of the profile of each vane decreases from the radially inner boundary of the vane towards the tip of the vane over at least 50% of the height of the vane. 
     
     
         5 . The outer guide vanes according to  claim 4 , wherein the deviation of the profile of each vane decreases from the radially inner boundary of the vane towards the tip of the vane to a first zone of the vane extending at a distance from the radially inner boundary of the vane of between 45% of the height of the vane and 85% of the height of the vane. 
     
     
         6 . The outer guide vanes according to  claim 5 , wherein the deviation of the profile of each vane increases from the first zone of the vane to the tip of the vane. 
     
     
         7 . The outer guide vanes-( 53  according to  claim 1 , wherein the deviation of the profile of each vane is greater than 20° over at least a portion of the vane extending from the radially inner boundary of the vane to a second zone of the vane extending at a distance of between 0% and 40% of the height of the vane. 
     
     
         8 . The outer guide vanes according to  claim 1 , wherein the deviation of the profile of each vane at the radially inner boundary of the vane is strictly greater than the deviation of the profile at the tip of the vane. 
     
     
         9 . The outer guide vanes according to  claim 1 , wherein a maximum deviation of the profile of each vane is located at a distance from the radially inner boundary of the vane of between 0% and 40% of the height of the vane. 
     
     
         10 . The outer guide vanes according to  claim 1 , wherein the deviation of the profile of each vane is less than 25° over a portion of the vane extending from the radially inner boundary to a distance of between 40% and 80% of the height of the vane. 
     
     
         11 . The outer guide vanes according to  claim 1 , wherein the deviation of the profile of each vane at the tip of the vane is of between 10° and 25°. 
     
     
         12 . The outer guide vanes according to  claim 5 , wherein the first zone of the vane extends at a distance from the radially inner boundary of the vane of between 45% of the height of the vane and 75% of the height of the vane, preferably between 50% of the height of the vane and 70% of the height of the vane. 
     
     
         13 . The outer guide vanes according to  claim 1 , wherein the deviation of the profile of each vane is less than 25° over a portion of the vane extending from a first distance of between 10% and 20% of the height of the vane to a second distance of between 80% and 100% of the height of the vane. 
     
     
         14 . The outer guide vanes according to  claim 1 , wherein the deviation of the profile of each vane at the tip of the vane is of between 25° and 35°. 
     
     
         15 . The outer guide vanes according to  claim 1 , wherein the deviation of the profile of each vane is strictly greater than 20° over the entire height of the vane. 
     
     
         16 . The outer guide vanes according to  claim 1 , wherein the deviation of the profile of each vane at the tip of the vane is greater than or equal to the deviation of the profile at the radially inner boundary of the vane. 
     
     
         17 . The outer guide vanes according to  claim 1 , comprising between 8 and 12 vanes. 
     
     
         18 . The outer guide vanes according to  claim 1 , wherein a length of the chord of each vane at the tip of the vane is less than 75% of a maximum chord of the vane. 
     
     
         19 . An unducted thrust-generating assembly for a turbine engine comprising:
 a propeller rotatable relative to a casing of the turbine engine; and   the outer guide vanes according to  claim 1  fixedly mounted on the casing and extending downstream of the propeller.   
     
     
         20 . The assembly according to  claim 19 , wherein the propeller comprises between ten and sixteen rotating blades. 
     
     
         21 . A turbine engine comprising:
 a casing; and   the unducted thrust-generating assembly according to  claim 19 , the propeller being rotatable relative to the casing and the outer guide vanes being fixed in rotation relative to the casing, downstream of the propeller.   
     
     
         22 . The turbine engine according to  claim 21 , wherein at least one of the propeller and the outer guide vanes has a variable pitch.